Machine design Assignment

  

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Machine Design Assignment
Exercise # M2: A pair of helical gears transmit 15 KW power and the pinion is rotating at 1000
rpm. The helix angle is 0.50 radians and the normal pressure angle is 0.35 radians. The pitch
diameter of the pinion is 70 mm and the pitch diameter of the gear is 210 mm. Determine the
tangential, radial, and axial forces between the gear teeth. (Answers: 4092, 1702, 2236 Newtons)
Exercise # M1 : A pair of spur gears with a pitch of 6 are in mesh. The pinion has 18 teeth and
rotates at 1800 rpm transmitting 0.5 Hp. Both gears have 20-degree pressure angles. The
number of teeth on the gear is 36. Determine the radial and tangential forces on the pinion.
Exercise #M4: A worm gear reducer is driven by a 1200 rpm motor. The worm has 3 threads
and the gear has 45 teeth. The circular pitch of the gear is p=0.5”, the center distance is 4.5
inches, the normal pressure angle is 20 degrees, and face-width of the gear is b=1 inch. Use a
coefficient of sliding friction of 0.029. Determine:
a) Gear and worm diameters, and worm Lead. (7.16, 1.84, 1.5 in)
b) The worm gear efficiency (88.6%)
c) Is the unit self-locking (No)

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